Grounding Line Location using Echograms - CReSIS

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• Plot the coordinates from the x-axis of the echogram and determine which direction the plane was flying and record in Table 1. Make sure to carefully label the points from each echogram so as to not confuse them with other years. • Repeat for each of the two 2007 images. You should have a total of 28 coordinates plotted. Table 2 - Fill in coordinates for estimated grounding line locations. 2003 A 2003 B 2007 A 2007 B Q8) Do the grounding lines fall between the flight lines? If not recalculate your estimated grounding line Q9) Briefly describe the changes you observe in the location of the grounding line in 2003, 2007. Q10) Briefly explain how you determined the flight direction for the data collected for each echogram. Explain: Q11) Does the location of your estimated grounding lines look the same as the Petermann Glacier Grounding Line Map (Figure 3)? If not, what are some possible sources of error? Q12) Why would it be important for researchers to record this type of data over several years? Extend: Latitude Longitude Flight Direction The northern part of Petermann Glacier experienced many dramatic changes in 2009 and 2010. Scientists have recorded images or video of the great glacier break-off from August 2010. • View the following videos related to Petermann Glacier. o Byrd Polar Research Center: http://bprc.osu.edu/wiki/Petermann_Glacier_before-after-photos_2010- 2011 o Discovery News: http://news.discovery.com/videos/news-arctic-melt-caught-on-video.html o Earth Observatory: http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=45112 • Recently processed 2011 data is now available on the CReSIS web site. A couple of images have been included on the ‘Petermann Glacier’ PDF. • Go through the same processes outlined above to determine the grounding line in 2011. Q13) How has the grounding line changed position since 2007? 2003? Figure 3 – Scientists accepted grounding line locations from 2003 and 2007 echogram data.
Evaluate: • Using a blank echogram, respond to the following questions/tasks: Q14) Trace and describe the snow surface and bedrock echo lines. Q15) Approximate the grounding line latitude and longitude and draw it on the echogram. Q16) Describe the general flight path of the plane over the glacier and the physical features of the glacier along this path. Q17) Suggest why an echogram would be important to a glaciologist.
Page 1 and 2: TEACHER PAGE - Trial Version * Afte
Page 3 and 4: o How is Glacier Goo Similar to a R
Page 5 and 6: • Go through the same processes o
Page 7: CReSIS measures ice sheet thickness
Page 11 and 12: Table 3 - Approximation of estimate
Page 13: Q15) See Figure 7 Figure 7 - Diagra

Grounding Line Location using Echograms - CReSIS

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